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freebsd/sys/teken/teken_scs.h
Ed Schouten e7fe3cf158 Fall back to ASCII codepoints for box drawing.
Even though the default VGA font provides box drawing fonts, there is no
guarantee any font will provide these as well (i.e. ISO-8859-*, KOI8-R).
Just use ASCII characters for box drawing.

PR:		kern/141633
2010-02-08 09:16:59 +00:00

81 lines
2.6 KiB
C

/*-
* Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
static inline teken_char_t
teken_scs_process(teken_t *t, teken_char_t c)
{
return (t->t_scs[t->t_curscs](t, c));
}
/* Unicode points for VT100 box drawing. */
static const uint16_t teken_boxdrawing_unicode[31] = {
0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
0x2424, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7
};
/* ASCII points for VT100 box drawing. */
static const uint8_t teken_boxdrawing_8bit[31] = {
'?', '?', 'H', 'F', 'C', 'L', '?', '?',
'N', 'V', '+', '+', '+', '+', '+', '-',
'-', '-', '-', '-', '+', '+', '+', '+',
'|', '?', '?', '?', '?', '?', '?',
};
static teken_char_t
teken_scs_special_graphics(teken_t *t, teken_char_t c)
{
/* Box drawing. */
if (c >= '`' && c <= '~')
return (t->t_stateflags & TS_8BIT ?
teken_boxdrawing_8bit[c - '`'] :
teken_boxdrawing_unicode[c - '`']);
return (c);
}
static teken_char_t
teken_scs_uk_national(teken_t *t, teken_char_t c)
{
/* Pound sign. */
if (c == '#')
return (t->t_stateflags & TS_8BIT ? 0x9c : 0xa3);
return (c);
}
static teken_char_t
teken_scs_us_ascii(teken_t *t __unused, teken_char_t c)
{
/* No processing. */
return (c);
}